^, L'HKARy Of Tur 



BULLETIN No. 453. 



SEPTEMBER 1926 



Meteorolooical Observations 



MASSACHUSETTS 



AGIIICULTUKAL EXPElllMENT 



STATION. 



Liititude, 42° 23' 48.5" N. Longitude 72* 31' 10" W. 



Height of barometer above ground, ji ft. Above sea level, 2jj.j ft. 

 Height oj Wind Instruments y 2 ft. Iwte used, y^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30.11, 27th, 9 a. 

 Minimum reduced to freezing, 29.50,9th, 6 p. 

 Reduced maximum reading, 30.41, 27th, 9 a. 

 Reduced minimum reading, 29.79,9th, 6 P. 



Mean semi-daily reduced 30.143 



Monthly range 0.62 



Air Tetnperjilure. 



In Degrees Fahr. 



Wind. 



Total movement 2416m 



Greatest daily movement 202m, 26th 



Least daily movement 9m, 28th 



Mean daily movement 80m 



Mean hourly velocity 3.3m 



Maximum pressure per squarefoot, 3.5 lbs = 



26m per hour, 26th, 8 a., N. 

 Maximum velocity for 5 minutes, i8m per 



hour, 26th, 2 A., N.W. 

 Prevailing direction. South Southwest 



Summary. 

 South 20 per cent. 



Highest S7.0, 25th, 2 p. 



Lowest 38.0,27th, 4 A. 



Mean hourly 59.3 



Mean of means of max. and min 59.8 



Mean sensible (wet bulb) iS-ol^;,;;;;; Southeast'. '. '. '. '. '. '. '. .'.3 



Monthly range 49°k:„rth i 



Highest mean daily 74 8, zsthkygj.^ ^ 



Lowest m'ean daily 47-6, ^ystJoji^g/^jiVJ^t'iJ,^; _' _' \ \ \ \ " _' ' ^ 



Mean maximum 71. 61 



Mean minimum 48.0 Weaiher. 



Mean daily range 23.6 j^^g^,j cloudiness observed 



Greatest daily range 40.5, iith 



Least daily range 6.0, 5th 



Humidity. 



Mean dew point 51.9 



Mean force of vapor 47S 



Mean relative humidity 83.5 



Precipitatibn. In inches. 



Total precipitation, in inches 1.50 



Number of days on which .01 incli or more 

 rain fell 8 



. 59 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 214 hours = 57 per cent 



Number of clear days 5 



Number of fair days 12 



Number of cloudy days 13 



Bright Sunshine. 



Numljer hours recorded, 159 — 43 per cent. 

 Rain, 2d, 5th, 6th, 9th, 13th, 16th, 17th, 23d 

 24th, 25th, 27th, 28th. 



Thunder and Li^htninii. 9tl<. 25th. 

 Gnles. None 



